I think everyday trust toward to the money is rapidly depleted, and people will finally realised how ignorant and gullible theyre to just earn the IOU garbage fake money, do you think crypto will trigger the complete bank run? Or any other delusional store of value that we dont know yet?
If you consider US dollar as one of the fake money you're talking about, why do bitcoin and other altcoins being analyze based on US dollar. Cryptocurrency won't elimnate the current currency. They'll exist together at the same time because they have different purpose in our system.
While there are many bitcoin believers who seems to be basing their perception on wishes and speculations, we have to remember that we are still living in a real world where control of the financial system is on the hands of the banking and financial sector and not so much with the people. Granted that this is the same system that bitcoin and the blockchain wanted to change but we are not there yet...and it can surely take many, many years before this can happen. In the next few decades I myself don't see the fiat money to be gone for good as that seems to be impossible -- what can happen is that fiat money and cryptocurrency can co-exist and I see no problem with that.